input: synaptics: defer touch resume to workqueue

During device resume, the touch resume function is called after
display resume. Touch resume function will take about >200ms.
Defer the touch resume function to a workqueue to reduce the total
device resume time. An optional DT property is added to enable this
on targets that need this feature.

Change-Id: Ia9b055144c5a7f29f0f0d57428cccbe15a7d7a87
Signed-off-by: zhaoyuan <yzhao@codeaurora.org>